K028 基于51/STM32 MAX30102心率模块测试 OLED数据与波形

一. 实现功能

BILIBILILI链接(直接戳跳转)

上电后OLED0.96显示心率血氧参数,手靠近后显示对应值和曲线
注意:STC89C52RC移植后发现内存太小没法测试,要测试51的需要用更大内存单片机

二. 硬件清单

  1. OLED0.96模块
  2. MAX30102心率模块
  3. STM32F103C8T6/STC89C52RC
  4. SWD或JLINK仿真器(直接用CH340串口模块烧录也行,不过注意配置BOOT)
  5. 杜邦线若干

三. 资料清单

程序代码

在这里插入图片描述

文档资料

在这里插入图片描述

四. 模块简介

1.基本参数

在这里插入图片描述

2.引脚说明

在这里插入图片描述

五. 接线

基于STM32 +模块接线


模块--------------OLED-------------- STM32
VCC-----------------------------------5V
GND-----------------------------------GND
SCL------------------------------------PB5
SDA------------------------------------PB8
INT-------------------------------------PB9

---------------------VCC--------------3.3V
---------------------GND--------------GND
---------------------SCL-------------- GPIOB_6
---------------------SDA-------------- GPIOB_7

六.代码说明

以下以32代码为例:

1. 模块引脚配置


//初始化IIC
void IIC_Init(void)
{					     
	GPIO_InitTypeDef GPIO_InitStructure;
	//RCC->APB2ENR|=1<<4;//先使能外设IO PORTC时钟 
	RCC_APB2PeriphClockCmd(	RCC_APB2Periph_GPIOB, ENABLE );	
	   
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;   //推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
 
	IIC_SCL=1;
	IIC_SDA=1;

}

2. 模块IIC基础函数


//产生IIC起始信号
void IIC_Start(void)
{
	SDA_OUT();     //sda线输出
	IIC_SDA=1;	  	  
	IIC_SCL=1;
	delay_us(4);
 	IIC_SDA=0;//START:when CLK is high,DATA change form high to low 
	delay_us(4);
	IIC_SCL=0;//钳住I2C总线,准备发送或接收数据 
}	  
//产生IIC停止信号
void IIC_Stop(void)
{
	SDA_OUT();//sda线输出
	IIC_SCL=0;
	IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
 	delay_us(4);
	IIC_SCL=1; 
	IIC_SDA=1;//发送I2C总线结束信号
	delay_us(4);							   	
}
//等待应答信号到来
//返回值:1,接收应答失败
//        0,接收应答成功
u8 IIC_Wait_Ack(void)
{
	u8 ucErrTime=0;
	SDA_IN();      //SDA设置为输入  
	IIC_SDA=1;delay_us(1);	   
	IIC_SCL=1;delay_us(1);	 
	while(READ_SDA)
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			IIC_Stop();
			return 1;
		}
	}
	IIC_SCL=0;//时钟输出0 	   
	return 0;  
} 
//产生ACK应答
void IIC_Ack(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA=0;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}
//不产生ACK应答		    
void IIC_NAck(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA=1;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}					 				     
//IIC发送一个字节
//返回从机有无应答
//1,有应答
//0,无应答			  
void IIC_Send_Byte(u8 txd)
{                        
    u8 t;   
	SDA_OUT(); 	    
    IIC_SCL=0;//拉低时钟开始数据传输
    for(t=0;t<8;t++)
    {              
        IIC_SDA=(txd&0x80)>>7;
        txd<<=1; 	  
		delay_us(2);   //对TEA5767这三个延时都是必须的
		IIC_SCL=1;
		delay_us(2); 
		IIC_SCL=0;	
		delay_us(2);
    }	 
} 	    
//读1个字节,ack=1时,发送ACK,ack=0,发送nACK   
u8 IIC_Read_Byte(unsigned char ack)
{
	unsigned char i,receive=0;
	SDA_IN();//SDA设置为输入
    for(i=0;i<8;i++ )
	{
        IIC_SCL=0; 
        delay_us(2);
		IIC_SCL=1;
        receive<<=1;
        if(READ_SDA)receive++;   
		delay_us(1); 
    }					 
    if (!ack)
        IIC_NAck();//发送nACK
    else
        IIC_Ack(); //发送ACK   
    return receive;
}

3. 模块读写函数


void IIC_WriteBytes(u8 WriteAddr,u8* data,u8 dataLength)
{		
	u8 i;	
    IIC_Start();  

	IIC_Send_Byte(WriteAddr);	    //发送写命令
	IIC_Wait_Ack();
	
	for(i=0;i<dataLength;i++)
	{
		IIC_Send_Byte(data[i]);
		IIC_Wait_Ack();
	}				    	   
    IIC_Stop();//产生一个停止条件 
	delay_ms(10);	 
}

void IIC_ReadBytes(u8 deviceAddr, u8 writeAddr,u8* data,u8 dataLength)
{		
	u8 i;	
    IIC_Start();  

	IIC_Send_Byte(deviceAddr);	    //发送写命令
	IIC_Wait_Ack();
	IIC_Send_Byte(writeAddr);
	IIC_Wait_Ack();
	IIC_Send_Byte(deviceAddr|0X01);//进入接收模式			   
	IIC_Wait_Ack();
	
	for(i=0;i<dataLength-1;i++)
	{
		data[i] = IIC_Read_Byte(1);
	}		
	data[dataLength-1] = IIC_Read_Byte(0);	
    IIC_Stop();//产生一个停止条件 
	delay_ms(10);	 
}

void IIC_Read_One_Byte(u8 daddr,u8 addr,u8* data)
{				  	  	    																 
    IIC_Start();  
	
	IIC_Send_Byte(daddr);	   //发送写命令
	IIC_Wait_Ack();
	IIC_Send_Byte(addr);//发送地址
	IIC_Wait_Ack();		 
	IIC_Start();  	 	   
	IIC_Send_Byte(daddr|0X01);//进入接收模式			   
	IIC_Wait_Ack();	 
    *data = IIC_Read_Byte(0);		   
    IIC_Stop();//产生一个停止条件	    
}

void IIC_Write_One_Byte(u8 daddr,u8 addr,u8 data)
{				   	  	    																 
    IIC_Start();  
	
	IIC_Send_Byte(daddr);	    //发送写命令
	IIC_Wait_Ack();
	IIC_Send_Byte(addr);//发送地址
	IIC_Wait_Ack();	   	 										  		   
	IIC_Send_Byte(data);     //发送字节							   
	IIC_Wait_Ack();  		    	   
    IIC_Stop();//产生一个停止条件 
	delay_ms(10);	 
}

4. 初始化函数


void max30102_init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;

 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);	
	GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_14;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
 	GPIO_Init(GPIOB, &GPIO_InitStructure);
	
	IIC_Init();
	
	max30102_reset();
	

	
	
	max30102_Bus_Write(REG_INTR_ENABLE_1,0xc0);	// 设置中断使能寄存器1 0x02
	max30102_Bus_Write(REG_INTR_ENABLE_2,0x00);	// 设置中断使能寄存器2 0x03
	max30102_Bus_Write(REG_FIFO_WR_PTR,0x00);  	//FIFO_WR_PTR[4:0] FIFO写指针指向下一个要写的内存地址 0x04
	max30102_Bus_Write(REG_OVF_COUNTER,0x00);  	//OVF_COUNTER[4:0] FIFO溢出丢失数据计数							0x05
	max30102_Bus_Write(REG_FIFO_RD_PTR,0x00);  	//FIFO_RD_PTR[4:0] FIFO读指针指向下一个要读的内存地址 0x06
	max30102_Bus_Write(REG_FIFO_CONFIG,0x0f);  	//sample avg = 1, fifo rollover=false, fifo almost full = 17  0x07
	max30102_Bus_Write(REG_MODE_CONFIG,0x03);  	//0x02 for Red only, 0x03 for SpO2 mode 0x07 multimode LED  0x09
	max30102_Bus_Write(REG_SPO2_CONFIG,0x27);  	// SPO2_ADC range = 4096nA, SPO2 sample rate (100 Hz), LED pulseWidth (400uS)  0x0A
	max30102_Bus_Write(REG_LED1_PA,0x24);   	//Choose value for ~ 7mA for LED1  0x0C
	max30102_Bus_Write(REG_LED2_PA,0x24);   	// Choose value for ~ 7mA for LED2  0x0D
	max30102_Bus_Write(REG_PILOT_PA,0x7f);   	// Choose value for ~ 25mA for Pilot LED  0x10


	

											
}

5. 主函数


int main(void)
{ 
	//variables to calculate the on-board LED brightness that reflects the heartbeats
	uint32_t un_min, un_max, un_prev_data;  
	int i;
	int32_t n_brightness;
	float f_temp;
	u8 temp_num=0;
	u8 temp[6];
	u8 str[100];
	u8 dis_hr=0,dis_spo2=0;
	I2C_Configuration(); 
	NVIC_Configuration();
	delay_init();	    	 //延时函数初始化	  
	uart_init(115200);	 	//串口初始化为115200

	
	//OLED
	OLED_Init();
	OLED_ShowString(0,0,"  initializing  ",16); 
	OLED_Refresh_Gram();//更新显示到OLED	 

	max30102_init();

	printf("\r\n MAX30102  init  \r\n");

	un_min=0x3FFFF;
	un_max=0;
	
	n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
	//read the first 500 samples, and determine the signal range
    for(i=0;i<n_ir_buffer_length;i++)
    {
        while(MAX30102_INT==1);   //wait until the interrupt pin asserts
        
				max30102_FIFO_ReadBytes(REG_FIFO_DATA,temp);
				aun_red_buffer[i] =  (long)((long)((long)temp[0]&0x03)<<16) | (long)temp[1]<<8 | (long)temp[2];    // Combine values to get the actual number
				aun_ir_buffer[i] = (long)((long)((long)temp[3] & 0x03)<<16) |(long)temp[4]<<8 | (long)temp[5];   // Combine values to get the actual number
								
        if(un_min>aun_red_buffer[i])
				{
            un_min=aun_red_buffer[i];    //update signal min
				}
        if(un_max<aun_red_buffer[i])
				{
            un_max=aun_red_buffer[i];    //update signal max
				}
    }
	un_prev_data=aun_red_buffer[i];
	//calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
    maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid); 
	
	while(1)
	{
		i=0;
        un_min=0x3FFFF;
        un_max=0;
		
		//dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
        for(i=100;i<500;i++)
        {
            aun_red_buffer[i-100]=aun_red_buffer[i];
            aun_ir_buffer[i-100]=aun_ir_buffer[i];
            
            //update the signal min and max
            if(un_min>aun_red_buffer[i])
            un_min=aun_red_buffer[i];
            if(un_max<aun_red_buffer[i])
            un_max=aun_red_buffer[i];
        }
		//take 100 sets of samples before calculating the heart rate.
        for(i=400;i<500;i++)
        {
            un_prev_data=aun_red_buffer[i-1];
            while(MAX30102_INT==1);
            max30102_FIFO_ReadBytes(REG_FIFO_DATA,temp);
						aun_red_buffer[i] =  (long)((long)((long)temp[0]&0x03)<<16) | (long)temp[1]<<8 | (long)temp[2];    // Combine values to get the actual number
						aun_ir_buffer[i] = (long)((long)((long)temp[3] & 0x03)<<16) |(long)temp[4]<<8 | (long)temp[5];   // Combine values to get the actual number
							
            if(aun_red_buffer[i]>un_prev_data)
            {
                f_temp=aun_red_buffer[i]-un_prev_data;
                f_temp/=(un_max-un_min);
                f_temp*=MAX_BRIGHTNESS;
                n_brightness-=(int)f_temp;
                if(n_brightness<0)
                    n_brightness=0;
            }
            else
            {
                f_temp=un_prev_data-aun_red_buffer[i];
                f_temp/=(un_max-un_min);
                f_temp*=MAX_BRIGHTNESS;
                n_brightness+=(int)f_temp;
                if(n_brightness>MAX_BRIGHTNESS)
                    n_brightness=MAX_BRIGHTNESS;
            }
			//send samples and calculation result to terminal program through UART
			if(ch_hr_valid == 1 && n_heart_rate<120)//**/ ch_hr_valid == 1 && ch_spo2_valid ==1 && n_heart_rate<120 && n_sp02<101
			{
				dis_hr = n_heart_rate;
				dis_spo2 = n_sp02;
			}
			else
			{
				dis_hr = 0;
				dis_spo2 = 0;
			}
				printf("HR=%i, ", n_heart_rate); 
				printf("HRvalid=%i, ", ch_hr_valid);
				printf("SpO2=%i, ", n_sp02);
				printf("SPO2Valid=%i\r\n", ch_spo2_valid);
		}
        maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
		
		//显示刷新

		if(dis_hr == 0 && dis_spo2 == 0)  //**dis_hr == 0 && dis_spo2 == 0
		{
			sprintf((char *)str,"HR:--- SpO2:--- ");//**HR:--- SpO2:--- 
		}
		else{
			sprintf((char *)str,"HR:%3d SpO2:%3d ",dis_hr,dis_spo2);//**HR:%3d SpO2:%3d 
		}
		OLED_ShowString(0,0,str,16);
		OLED_Fill(0,23,127,63,0);
		//红光在上,红外在下
		dis_DrawCurve(aun_red_buffer,20);
		dis_DrawCurve(aun_ir_buffer,0);
		OLED_Refresh_Gram();//更新显示到OLED	 
	}
}

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版权声明:本文为CSDN博主「单片机代码搬运工」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/lfmnlxx79691557/article/details/121388683

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